The active ingredient in Gentrol IGR, (s)-hydroprene, translocates to provide complete coverage for a number of insects. That means Gentrol IGR can move into wall voids as well as cracks and crevices, manufacturer Central Life Sciences reports. Insects such as cockroaches do not have to come into direct contact for it to be effective. Gentrol IGR is a long-lasting insect growth regulator (IGR) that disrupts normal development and molting while providing continuous protection for up to four months, Central Life says. Be sure to visit booth #301 at PestWorld 2013.